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| Rev 821 | Rev 832 | ||
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| Line 18... | Line 18... | ||
| 18 | volatile int16_t PPM_in[15]; //PPM24 supports 12 channels per frame |
18 | volatile int16_t PPM_in[15]; //PPM24 supports 12 channels per frame |
| 19 | volatile int16_t PPM_diff[15]; |
19 | volatile int16_t PPM_diff[15]; |
| 20 | volatile uint8_t NewPpmData = 1; |
20 | volatile uint8_t NewPpmData = 1; |
| 21 | volatile int16_t RC_Quality = 0; |
21 | volatile int16_t RC_Quality = 0; |
| Line -... | Line 22... | ||
| - | 22 | ||
| - | 23 | volatile uint8_t NewRCFrames = 0; |
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| Line 22... | Line 24... | ||
| 22 | 24 | ||
| 23 | 25 | ||
| 24 | /***************************************************************/ |
26 | /***************************************************************/ |
| 25 | /* 16bit timer 1 is used to decode the PPM-Signal */ |
27 | /* 16bit timer 1 is used to decode the PPM-Signal */ |
| Line 76... | Line 78... | ||
| 76 | SREG = sreg; |
78 | SREG = sreg; |
| 77 | } |
79 | } |
| Line 78... | Line 80... | ||
| 78 | 80 | ||
| 79 | 81 | ||
| 80 | // happens every 0.209712 s. |
82 | // happens every 0.209712 s. |
| 81 | // check for at least one input capture event per timer overflow (timeout) |
83 | // check for at least one new frame per timer overflow (timeout) |
| 82 | ISR(TIMER1_OVF_vect) |
- | |
| 83 | { |
- | |
| 84 | static uint16_t lastICR1 = 0; |
- | |
| 85 | // if ICR1 has not changed |
84 | ISR(TIMER1_OVF_vect) |
| 86 | // then no new input capture event has occured since last timer overflow |
85 | { |
| 87 | if (lastICR1 == ICR1) RC_Quality /= 2; |
86 | if (NewRCFrames == 0) RC_Quality /= 2; |
| Line 88... | Line 87... | ||
| 88 | lastICR1 = ICR1; // store last ICR1 |
87 | NewRCFrames = 0; |
| 89 | } |
88 | } |
| Line 128... | Line 127... | ||
| 128 | //sync gap? (3.52 ms < signal < 25.6 ms) |
127 | //sync gap? (3.52 ms < signal < 25.6 ms) |
| 129 | if((signal > 1100) && (signal < 8000)) |
128 | if((signal > 1100) && (signal < 8000)) |
| 130 | { |
129 | { |
| 131 | // if a sync gap happens and there where at least 4 channels decoded before |
130 | // if a sync gap happens and there where at least 4 channels decoded before |
| 132 | // then the NewPpmData flag is reset indicating valid data in the PPM_in[] array. |
131 | // then the NewPpmData flag is reset indicating valid data in the PPM_in[] array. |
| - | 132 | if(index >= 4) |
|
| - | 133 | { |
|
| 133 | if(index >= 4) NewPpmData = 0; // Null means NewData for the first 4 channels |
134 | NewPpmData = 0; // Null means NewData for the first 4 channels |
| - | 135 | NewRCFrames++; |
|
| - | 136 | } |
|
| 134 | // synchronize channel index |
137 | // synchronize channel index |
| 135 | index = 1; |
138 | index = 1; |
| 136 | } |
139 | } |
| 137 | else // within the PPM frame |
140 | else // within the PPM frame |
| 138 | { |
141 | { |